Q24, MySQL/MariaDB version: DAYOFWEEK() gives 1 for Sunday.   [7 row(s)]
dow | day | bills | charged
----+-----+-------+------------
0   | Sun | 458   | 22099000.00
1   | Mon | 430   | 21653000.00
2   | Tue | 400   | 19940000.00
3   | Wed | 382   | 18336000.00
4   | Thu | 413   | 19725000.00
5   | Fri | 361   | 17179000.00
6   | Sat | 509   | 25281000.00
